12. The boy's parents the operation last week had it not been for the donations from our school.
A. couldn't have paid for
B. couldn't pay for
C. shouldn't have paid for
D. wouldn't pay for
12. A考查非真实条件句的虚拟语气。句意：要不是我们学校的捐款，这个男孩儿的父母上周不可能付清手术费。根据句中已知的时间状语last week，可排除B、D。而couldn't have
paid for意为"不可能付 "；shouldn't have paid for意为"本不应该付……"。根据句意可知选A。
【拓展延伸】要不是：（l)but for...(介词短语，与过去或现在事实相反）
(2)had it not been for ... = if it hadn't been for ...(与过去事实相反）
(3)were it not for... = if it were not for ...(与现在事实相反）
题目来源：2015全品语法快练高中英语新课标 > 训练23 情态动词和虚拟语气
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